short answer:
no they're not helpful (even though ive never been to a lecture before[/b[)
hmmmmmm :/ I think if someone hasn't used a company, take their review with a grain of salt. That goes for TSFX, NEAP, Connect (yes, even Connect! (but i have heard good things)) and the rest. Remember: People do rely on the information you are giving so make sure you have something to back it up. At least Paul said he hasn't gone to one.
Look, it depends on your learning style and the lecturer. I've been to D.Ha for his summer holidays program and he was brilliant, going to his lecture this year too. I went to TSFX last year for yr11 and it wasn't so good in my opinion, but it depends on the lecturer as well. Lectures are a good way of revising the course in half a day. I go to a lecture to find out where my weak points are, not to learn concepts. If that's how you are going to treat it, then they would be useful. If you want to learn then self study/private tutor is the way to go.